1672157 has 4 divisors (see below), whose sum is σ = 1674876. Its totient is φ = 1669440.

The previous prime is 1672129. The next prime is 1672199. The reversal of 1672157 is 7512761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7512761 = 431 ⋅17431.

It can be written as a sum of positive squares in 2 ways, for example, as 942841 + 729316 = 971^2 + 854^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672157 - 2¹⁰ = 1671133 is a prime.

It is a super-2 number, since 2×1672157² = 5592218065298, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53 + ... + 1829.

It is an arithmetic number, because the mean of its divisors is an integer number (418719).

2^1672157 is an apocalyptic number.

It is an amenable number.

1672157 is a deficient number, since it is larger than the sum of its proper divisors (2719).

1672157 is an equidigital number, since it uses as much as digits as its factorization.

1672157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718.

The product of its digits is 2940, while the sum is 29.

The square root of 1672157 is about 1293.1190973766. The cubic root of 1672157 is about 118.6931576524.

The spelling of 1672157 in words is "one million, six hundred seventy-two thousand, one hundred fifty-seven".